There is a huge need for construction materials, at the same time the planet everywhere is littered by millions of used car tires. A way has to be found for re-using the materials that car tires are made of: rubber and steel.
Large scale processes for this are well known. At the smallest scale of use in poverty better method of recuperation have to be developed.
Each car tire contains 35 meter of steel wire with a 1 mm cross section. The side walls add up to 0,2 m2 strong 4 mm thick rubber sheet, the tread offers a 1,6 meter long and extremely strong strip of steel reinforced rubber.
When the properties of the composing parts of a used rubber tire are well understood, then the practice of recuperation can be adapted to it. To cut rubber can be done with a small sharp knife when is understood how to separate rubber at the actual place of cutting to minimize the friction between the knife and the rubber. The way Demotech learned to separate a car tire into useful part is explained in this manual on harvesting steel wire.